Java 9 : How to list all processes running on the OS

Points to Remember

  1. Java 9 introduced the new Process Api in java.lang package.
  2. ProcessHandle interface can be used to perform operations with processes like start, destroy, list processes.

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List all Processes running on the OS.

To get all the processes running on the OS you can use the static method allProcesses() of the ProcessHandle, this will return a Stream<ProcessHandle> stream of process handles which can be used to get information about each process. The below example shows how we can list all the running processes.

import java.lang.ProcessHandle;
import java.util.stream.Stream;

/**
 * @author ekiras
 */
public class ListAllProcesses {

    public static void main(String[] args){
        allProcesses();
    }

    public static void allProcesses() {
        System.out.println("Process list:");
        Stream<ProcessHandle> processStream = ProcessHandle.allProcesses();
        processStream.forEach(e -> printProcessInfo(e));
    }

    public static void printProcessInfo(ProcessHandle processHandle){
        System.out.println("---------------------------------------------------------");
        System.out.println(" Process Id :: " + processHandle.getPid());
        System.out.println(" Process isAlive() :: " + processHandle.isAlive());
        System.out.println(" Process children :: " + processHandle.children().count());
        System.out.println(" Process supportsNormalTermination() :: " + processHandle.supportsNormalTermination());
        System.out.println(" Process Info :: " + processHandle.info().toString());

    }

}

The above code will produce the following output on console.

Process list:
---------------------------------------------------------
 Process Id :: 1
 Process isAlive() :: true
 Process children :: 0
 Process supportsNormalTermination() :: true
 Process Info :: [user: Optional[root], cmd: /bin/bash, startTime: Optional[2016-11-14T05:24:57.150Z], totalTime: Optional[PT0.02S]]
---------------------------------------------------------
 Process Id :: 15
 Process isAlive() :: true
 Process children :: 1
 Process supportsNormalTermination() :: true
 Process Info :: [user: Optional[root], cmd: /bin/bash, startTime: Optional[2016-11-14T05:25:06.670Z], totalTime: Optional[PT0.08S]]
---------------------------------------------------------
 Process Id :: 449
 Process isAlive() :: true
 Process children :: 0
 Process supportsNormalTermination() :: true
 Process Info :: [user: Optional[root], cmd: /opt/jdk-9/bin/java, args: [ListAllProcesses], startTime: Optional[2016-11-14T07:38:41.240Z], totalTime: Optional[PT0.35S]]

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